SmogRank / South Korea / Jeju-do / Seogwipo
Seogwipo, month by month
Seogwipo has a measured daily mean on 897 days since 23 March 2024. Its worst month was March 2025, at 66 US AQI (17.2 µg/m³), 758th of 2,862 cities on that month's world ranking. Its cleanest was July 2024, at 30 US AQI (5.4 µg/m³). 2025 averaged 56 US AQI (11.9 µg/m³), against 55 US AQI (11.4 µg/m³) in 2024.
Every month since 2024
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
2 months
| Month | Why |
|---|---|
| Jul 2026 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 9 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Seogwipo's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2025 | 6617.2 µg/m³ | 758thof 2,862 | Japan and South Korea, March 2025 Japan and South Korea, February and March 2025 |
| January 2025 | 6617.0 µg/m³ | 397thof 2,474 | Japan and South Korea, 17 to 24 January 2025 South Korea, 13 to 14 January 2025and 1 more |
| April 2024 | 6415.9 µg/m³ | 364thof 2,520 | Japan and South Korea, April 2024 |
| March 2026 | 6315.7 µg/m³ | 787thof 2,971 | Japan and South Korea, March 2026 |
| April 2025 | 6315.4 µg/m³ | 529thof 2,951 | – |
| December 2024 | 6215.1 µg/m³ | 465thof 2,616 | Jeju-do, Gangwon-do and Jeollanam-do, South Korea, December 2024 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Seogwipo's worst days
| Day | US AQI | Episode |
|---|---|---|
| 20 Jan 2025 | 12645.7 µg/m³ | Japan and South Korea, 17 to 24 January 2025 |
| 27 Mar 2026 | 11240.0 µg/m³ | Japan and South Korea, March 2026 |
| 22 Mar 2025 | 11039.0 µg/m³ | Japan and South Korea, March 2025 |
| 18 Apr 2024 | 10738.1 µg/m³ | Japan and South Korea, April 2024 |
| 7 May 2024 | 10637.4 µg/m³ | – |
| 25 Mar 2025 | 10336.2 µg/m³ | Japan and South Korea, March 2025 |
| 24 Jan 2025 | 10236.1 µg/m³ | Japan and South Korea, 17 to 24 January 2025 |
| 19 Apr 2024 | 9935.1 µg/m³ | Japan and South Korea, April 2024 |
| 28 Mar 2026 | 9935.1 µg/m³ | Japan and South Korea, March 2026 |
| 27 Feb 2025 | 9935.0 µg/m³ | Japan and South Korea, February and March 2025 |
Daily means, the highest since 23 Mar 2024; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Seogwipo, South Korea, 23 Mar 2024 – 12 Oct 2026. Monitor data from Korea Air Ministry of Environment via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/kr/seogwipo/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Seogwipo now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).